---
lang: en
title: 'API docs: metadata.metadatakey'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/metadata
permalink: /doc/en/lb4/apidocs.metadata.metadatakey.html
---

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[Home](./index.md) &gt; [@loopback/metadata](./metadata.md) &gt; [MetadataKey](./metadata.metadatakey.md)

## MetadataKey type

Key for metadata access via reflection

<b>Signature:</b>

```typescript
export declare type MetadataKey<T, D extends DecoratorType> = MetadataAccessor<T, D> | string;
```